Question 1

A formula is a shorthand way of representing a chemical reaction.

Accepted Answer

A) True 
 B)False

Question 2

How many grams of AgNO3 are needed to make 250 mL of an aqueous solution that is 0.135 mol L-1?

Accepted Answer

A) 0.0917 g 
B) 0.174 g 
C) 5.73 g 
D) 91.7 g 
A) 0.0917 g 
B) 0.174 g 
C) 5.73 g 
D) 91.7 g

Question 3

What volume of concentrated acetic acid  
Is needed to prepare 250 mL of a 0.30 M aqueous solution?

Accepted Answer

A) 4.7 mL 
B) 4.3 mL 
C) 3.0 mL 
D) 2.5 mL 
E) 2.2 mL 
A) 4.7 mL 
B) 4.3 mL 
C) 3.0 mL 
D) 2.5 mL 
E) 2.2 mL

Question 4

Identify the coefficient of NO(g)when the following reaction is balanced,and calculate the volume of nitrogen monoxide gas produced when 8.00 g of ammonia is reacted with 12.0 g of oxygen at 25 °C.The density of nitrogen monoxide at  
Is 1.23 g L-1.
(unbalanced)NH3(g)+ O2(g)→ NO(g)+ H2O(l)

Accepted Answer

A) coefficient 4,volume 7.32 L 
B) coefficient 1,volume 11.1 L 
C) coefficient 2,volume 11.5 L 
D) coefficient 3,volume 17.3 L 
A) coefficient 4,volume 7.32 L 
B) coefficient 1,volume 11.1 L 
C) coefficient 2,volume 11.5 L 
D) coefficient 3,volume 17.3 L

Question 5

A student prepared a stock solution by dissolving 10.0 g of KOH in enough water to make 150 mL of solution.She then took 15.0 mL of the stock solution and diluted it with enough water to make 65.0 mL of a final solution.What is the concentration of KOH for the final solution?

Accepted Answer

A) 0.274 mol L-1 
B) 0.356 mol L-1 
C) 2.81 mol L-1 
D) 3.65 mol L-1 
A) 0.274 mol L-1 
B) 0.356 mol L-1 
C) 2.81 mol L-1 
D) 3.65 mol L-1

Question 6

The Haber Process for the production of ammonia is represented by:
3 H2(g)+ N2(g)→ 2 NH3(g)
If a mixture of 30 g of hydrogen with 10 g of nitrogen produced 8.4 g of ammonia,what was the percent yield?

Accepted Answer

A) 84% 
B) 69% 
C) 49% 
D) 28% 
E) 20% 
A) 84% 
B) 69% 
C) 49% 
D) 28% 
E) 20%

Question 7

Lithium and nitrogen react in a combination reaction to produce lithium nitride:
6 Li(s)+ N2(g)→ 2Li3N(s)
In a particular experiment,3.50 g samples of each reagent are reacted.What is the theoretical yield of lithium nitride?

Accepted Answer

A) 3.52 g 
B) 2.93 g 
C) 17.6 g 
D) 5.85 g 
E) 8.7 g 
A) 3.52 g 
B) 2.93 g 
C) 17.6 g 
D) 5.85 g 
E) 8.7 g

Question 8

Given the reaction:
2KMnO4 + 10 KI + 8 H2SO4 → 6 K2SO4 + 2 MnSO4 + 5 I2 + 8 H2O
How many moles of H2SO4 are required to produce 2.0 moles of I2,given the other reactants are in excess?

Accepted Answer

A) 0.80 mol 
B) 1.3 mol 
C) 3.2 mol 
D) 4.0 mol 
E) 1.6 mol 
A) 0.80 mol 
B) 1.3 mol 
C) 3.2 mol 
D) 4.0 mol 
E) 1.6 mol

Question 9

What is the molarity of methanol,  
If 150.0 mL is dissolved in enough water to make 4.00 L of solution?

Accepted Answer

A) 3.71 M 
B) 1.17 M 
C) 1.48 M 
D) 0.927 M 
E) 0.734 M 
A) 3.71 M 
B) 1.17 M 
C) 1.48 M 
D) 0.927 M 
E) 0.734 M

Question 10

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients?
Al(s)+ HCl(aq)→ AlCl3(aq)+ H2(g)

Accepted Answer

A) 13 
B) 11 
C) 18 
D) 19 
E) 21 
A) 13 
B) 11 
C) 18 
D) 19 
E) 21

Question 11

How many grams of CH3OH  must be added to water to prepare 150 mL of a solution that is 2.0 mol L-1 CH3OH?

Accepted Answer

Question 12

What are the smallest,whole-number coefficients in front of NO3-(aq)and Zn(s)when the following redox equation is balanced? The reaction occurs in acidic solution.
________ NO3-(aq)+ ________ Zn(s)→ ________ NO(g)+ ________ Zn2+(aq)?

Accepted Answer

A) 2,3 
B) 2,6 
C) 3,4 
D) 3,6 
A) 2,3 
B) 2,6 
C) 3,4 
D) 3,6

Question 13

A stock solution of   Is prepared and found to contain 13.5 mol L-1 of   (aq).If 25.0 mL of the stock solution is diluted with water to a final volume of 0.500 L,what is the concentration of the diluted solution?

Accepted Answer

A) 0.270 mol L-1 
B) 1.48 mol L-1 
C) 0.675 mol L-1 
D) 675 mol L-1 
E) 270 mol L-1 
A) 0.270 mol L-1 
B) 1.48 mol L-1 
C) 0.675 mol L-1 
D) 675 mol L-1 
E) 270 mol L-1

Question 14

The molarity of a solution that contains 14.7 g of H2SO4 in 200.0 mL solution is ________.

Accepted Answer

A) 1.5 M 
B) 0.75 M 
C) 0.77 M 
D) 7.4 M 
E) 3.0 M 
A) 1.5 M 
B) 0.75 M 
C) 0.77 M 
D) 7.4 M 
E) 3.0 M

Question 15

What is the molarity of formaldehyde in a solution containing 0.25 g of formaldehyde (CH2O)per mL?

Accepted Answer

A) 2.5 M 
B) 25 M 
C) 8.3 M 
D) 83 M 
E) 4.0 M 
A) 2.5 M 
B) 25 M 
C) 8.3 M 
D) 83 M 
E) 4.0 M

Question 16

What is the percent yield if 122 grams of SiO2 are made from 246 g of Cr2O3 by the following equation?
3 Si(s)+ 2 Cr2O3(s)→ 3 SiO2(s)+ 4 Cr(l)

Accepted Answer

A) 83.6% 
B) 49.6% 
C) 125% 
D) 33.1% 
E) 59.3% 
A) 83.6% 
B) 49.6% 
C) 125% 
D) 33.1% 
E) 59.3%

Question 17

If 0.500 mol of CaCl2 is mixed with 0.200 mol Na3PO4,the maximum amount in moles of Ca3(PO4)2 that can be formed is:

Accepted Answer

A) 0.17 
B) 0.20 
C) 0.10 
D) 0.67 
E) 0.50 
A) 0.17 
B) 0.20 
C) 0.10 
D) 0.67 
E) 0.50

Question 18

Cryolite is a compound needed for the Hall-Heroult process for producing aluminum.Cryolite is produced by the following reaction:
6 HF + Al(OH)3 + 3 NaOH → Na3AlF6 + 6 H2O
How many grams of cryolite are produced if the reaction has a 67.3% yield and a limiting reagent of 35.4 grams of NaOH?

Accepted Answer

A) 61.9 g 
B) 41.7 g 
C) 125 g 
D) 186 g 
E) 20.2 g 
A) 61.9 g 
B) 41.7 g 
C) 125 g 
D) 186 g 
E) 20.2 g

Question 19

Acetylene gas may be produced by carefully adding water to calcium carbide,according to the equation:
CaC2(s)+ 2 H2O(l)→ Ca(OH)2(s)+ C2H2(g)
When a 37 g sample of an impure calcium carbide was treated with excess water,13 g of acetylene gas was produced.If the reaction is essentially 100% efficient,what was the percentage of nonreacting impurity in the carbide sample?

Accepted Answer

A) 86% 
B) 58% 
C) 42% 
D) 35% 
E) 13.5% 
A) 86% 
B) 58% 
C) 42% 
D) 35% 
E) 13.5%

Question 20

Calculate the concentration (M)of sodium ions in a solution made by diluting 40.0 mL of a 0.474 mol L-1 of an aqueous solution of sodium sulfide with water to a total volume of 300 mL.

Accepted Answer

Exam 4: Chemical Reactions

A formula is a shorthand way of representing a chemical reaction.

How many grams of AgNO3 are needed to make 250 mL of an aqueous solution that is 0.135 mol L-1?

What volume of concentrated acetic acid Is needed to prepare 250 mL of a 0.30 M aqueous solution?

Identify the coefficient of NO(g)when the following reaction is balanced,and calculate the volume of nitrogen monoxide gas produced when 8.00 g of ammonia is reacted with 12.0 g of oxygen at 25 °C.The density of nitrogen monoxide at Is 1.23 g L-1. (unbalanced)NH3(g)+ O2(g)→ NO(g)+ H2O(l)

A student prepared a stock solution by dissolving 10.0 g of KOH in enough water to make 150 mL of solution.She then took 15.0 mL of the stock solution and diluted it with enough water to make 65.0 mL of a final solution.What is the concentration of KOH for the final solution?

The Haber Process for the production of ammonia is represented by: 3 H2(g)+ N2(g)→ 2 NH3(g) If a mixture of 30 g of hydrogen with 10 g of nitrogen produced 8.4 g of ammonia,what was the percent yield?

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6 Li(s)+ N2(g)→ 2Li3N(s) In a particular experiment,3.50 g samples of each reagent are reacted.What is the theoretical yield of lithium nitride?

Given the reaction: 2KMnO4 + 10 KI + 8 H2SO4 → 6 K2SO4 + 2 MnSO4 + 5 I2 + 8 H2O How many moles of H2SO4 are required to produce 2.0 moles of I2,given the other reactants are in excess?

What is the molarity of methanol, If 150.0 mL is dissolved in enough water to make 4.00 L of solution?

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? Al(s)+ HCl(aq)→ AlCl3(aq)+ H2(g)

How many grams of CH3OH must be added to water to prepare 150 mL of a solution that is 2.0 mol L-1 CH3OH?

What are the smallest,whole-number coefficients in front of NO3-(aq)and Zn(s)when the following redox equation is balanced? The reaction occurs in acidic solution. ________ NO3-(aq)+ ________ Zn(s)→ ________ NO(g)+ ________ Zn2+(aq)?

A stock solution of Is prepared and found to contain 13.5 mol L-1 of (aq).If 25.0 mL of the stock solution is diluted with water to a final volume of 0.500 L,what is the concentration of the diluted solution?

The molarity of a solution that contains 14.7 g of H2SO4 in 200.0 mL solution is ________.

What is the molarity of formaldehyde in a solution containing 0.25 g of formaldehyde (CH2O)per mL?

What is the percent yield if 122 grams of SiO2 are made from 246 g of Cr2O3 by the following equation? 3 Si(s)+ 2 Cr2O3(s)→ 3 SiO2(s)+ 4 Cr(l)

If 0.500 mol of CaCl2 is mixed with 0.200 mol Na3PO4,the maximum amount in moles of Ca3(PO4)2 that can be formed is:

Cryolite is a compound needed for the Hall-Heroult process for producing aluminum.Cryolite is produced by the following reaction: 6 HF + Al(OH)3 + 3 NaOH → Na3AlF6 + 6 H2O How many grams of cryolite are produced if the reaction has a 67.3% yield and a limiting reagent of 35.4 grams of NaOH?

Calculate the concentration (M)of sodium ions in a solution made by diluting 40.0 mL of a 0.474 mol L-1 of an aqueous solution of sodium sulfide with water to a total volume of 300 mL.

Matter: Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Compounds

Introduction to Reactions in Aqueous Solutions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Valence Bond and Molecular Orbital Theories

Intermolecular Forces: Liquids and Solids

Spontaneous Change: Entropy and Gibbs Energy

Solutions and Their Physical Properties

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acidbase Equilibria

Solubility and Complex-Ion Equilibria

Electrochemistry

Chemical Kinetics

Chemistry of the Main-Group Elements I: Groups 1,2,13,and 14

Chemistry of the Main-Group Elements Ii: Groups 18,17,16,15,and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

How many grams of AgNO₃ are needed to make 250 mL of an aqueous solution that is 0.135 mol L^-1?

Identify the coefficient of NO(g)when the following reaction is balanced,and calculate the volume of nitrogen monoxide gas produced when 8.00 g of ammonia is reacted with 12.0 g of oxygen at 25 °C.The density of nitrogen monoxide at Is 1.23 g L^-1. (unbalanced)NH₃(g)+ O₂(g)→ NO(g)+ H₂O(l)

The Haber Process for the production of ammonia is represented by: 3 H₂(g)+ N₂(g)→ 2 NH₃(g) If a mixture of 30 g of hydrogen with 10 g of nitrogen produced 8.4 g of ammonia,what was the percent yield?

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6 Li(s)+ N₂(g)→ 2Li₃N(s) In a particular experiment,3.50 g samples of each reagent are reacted.What is the theoretical yield of lithium nitride?

Given the reaction: 2KMnO₄ + 10 KI + 8 H₂SO₄ → 6 K₂SO₄ + 2 MnSO₄ + 5 I₂ + 8 H₂O How many moles of H₂SO₄ are required to produce 2.0 moles of I₂,given the other reactants are in excess?

What is the sum of the coefficients when the following is balanced with the smallest integer coefficients? Al(s)+ HCl(aq)→ AlCl₃(aq)+ H₂(g)

How many grams of CH₃OH must be added to water to prepare 150 mL of a solution that is 2.0 mol L^-1 CH₃OH?

What are the smallest,whole-number coefficients in front of NO₃^-(aq)and Zn(s)when the following redox equation is balanced? The reaction occurs in acidic solution. NO₃^-(aq)+ Zn(s)→ NO(g)+ Zn²⁺(aq)?

A stock solution of Is prepared and found to contain 13.5 mol L^-1 of (aq).If 25.0 mL of the stock solution is diluted with water to a final volume of 0.500 L,what is the concentration of the diluted solution?

The molarity of a solution that contains 14.7 g of H₂SO₄ in 200.0 mL solution is ________.

What is the molarity of formaldehyde in a solution containing 0.25 g of formaldehyde (CH₂O)per mL?

What is the percent yield if 122 grams of SiO₂ are made from 246 g of Cr₂O₃ by the following equation? 3 Si(s)+ 2 Cr₂O₃(s)→ 3 SiO₂(s)+ 4 Cr(l)

If 0.500 mol of CaCl₂ is mixed with 0.200 mol Na₃PO₄,the maximum amount in moles of Ca₃(PO₄)₂ that can be formed is:

Calculate the concentration (M)of sodium ions in a solution made by diluting 40.0 mL of a 0.474 mol L^-1 of an aqueous solution of sodium sulfide with water to a total volume of 300 mL.